[Users] meeting minutes for 2023-02-02

[Roland Haas]

Present: Roland, Peter, Sam, Alireza, Aviral, CHeng-Hsin, Gabriele,
Helvi, Jay, Keith, Leo, Liwei, Steve, Yosef, Zach

ET release contributions:

* FB Moncrief disk
** Roland reported on status, still rough around the edges
** Issues reported with underlying thorn that need to be fixed first
** Zach will look into thorn issues
** UIdaho is starting up a group of students that are working on
creating cvisualizations for this

* READ / WRITE for Baikal
** updates to Baikal, mostly regular development
** removal of checkpoint / recovery for RHS variables which do not need
to be checkpointed
** removes an no-op ApplyBCs
** Leo will review

* Elliptica reader
** spectral XCTS solver, arbitrary spin for fluid body, mixed systems
possible
** Alireza has reader public for BAM, ID already exists, solver will be
public as well
** would want to change so that it no longer uses a temporary
** please keep release managers (Leo, Sam) in the loop

* FUKA reader
** Samuel could not make it
** ticket has some description of what is available
** used in multiple publications
** code is used in publications

* CarpetX inclusion
** too large an inclusion and not yet in state ready to include
** will start review now, aiming for inclusion in November
** 3 reviewers would be great
** Steve, Zach
** UIUC strong gravity group might be interested to review (porting
physics code)

* AsterX inclusion
** depends on CarpetX so postponed

* IllinoisGRMHD, NRPyEOS, NRPyLeakage
** effectively one large update to IllinoisGRMHD that changes con2prim
(Palenzuela, Newman&Hamlin, methods from Siegel et al. paper)
** support tabulated EOS, interpolators ported from O'Conner et al.
cleaned up slightly
** specific EOS generated depends on compile time code generation
** NRPyLeakage is simple leakage code based on Ruffert prescription
** both NRPyEOS and NRPyLeakage are independent of IllinoisGRMHD
** used in publication, documented in jupyter notebooks
** Gabriele asked about ID thorn for TOV stars, IllinoisGRMHD updates
will have a new TOV ID generator to produce EOS for this
** Sam will review IllinoisGRMHD

* particle_tracerET
** major bugfix earlier in 2022 that affected interaction with mesh
refinement
** this new change adds more output formats and more data that can be
output
** currently this custom format is the default
** may announce change of default output behaviour

* TwoPunctures_BBHSF and NPScalars_SF 
** produces initial data for black holes and a massive scalar field
** part of Canuda
** NPScalar_SF computes Newman-Penrose scalars including contributions
from these massive scalar fields
** Zach is asking if it would be possible to instead extend the
existing TP thorn. Helvi explained that some changes go beyond adding a
term to Tmunu since scalar field scale differently.
** Gabriele mentioned that TP was at one point extended to support
arbitray scaled matter field, but that this functionality was never
really well documented and seems tightly coupled to TOVSolver
** Gabriele brought up issue that default values of parameters in
TwoPunctures are no longer always the best, and that using Taylor
expansion for data interpolation is no longer required (for speed
reasons). In the new thorn the defaults could be modernized.

* kuibit update to 1.4
** mostly library update
** impossible to list pip dependencies that allow use with Python 3.7
** can use kuibit 3.6 on older clusters, "pip install kuibit" will
install the newest version available

chair next week: Sam
minutes next week: Steve

Yours,
Roland
-- 
My email is as private as my paper mail. I therefore support encrypting
and signing email messages. Get my PGP key from http://pgp.mit.edu .
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